In place of Ratman who cancelled at the last minute, Mana joins Kitaro and the others on their trip. They're headed to an inn exclusive to youkai - the Immortal Onsen. Everyone's getting the most out of the hot springs, but suddenly, the inn is wrapped in an unsettling noise. The source is underground, the riotous energy from Mt. Fuji. Appeasing it is the job of the owner of the inn, but the current proprietress, Nebutori, is so fat she can't always do her work. Mana offers to serve in her place. Mana and Kitaro go into the caves of Mt. Fuji, and a huge shadow closes in on them...!?
Perhaps the elixir of immortality that
China's Qin Shi Huang sought...
ربما إكسير الخلود الذي ابتغاه
...الملك الصيني تشين شي هوانج
Vielleicht ist das Elixier des ewigen Lebens,
das Qin Shi Huang in China gesucht hat …
Tal vez el elixir de la inmortalidad 
que Qin Shi Huang de China buscaba…
Tal vez, el elixir de la inmortalidad
que Qin Shi Huang de China buscaba…
Peut-être que le secret que cherchait
l’empereur Qin Shi Huang se trouverait…
Può darsi che l'elisir dell'immortalità 
che l'imperatore cinese Qin Shi Huang cercava accanitamente...
Talvez o elixir da imortalidade que
Qin Shi Huang da China buscava...
Наверное, тот самый эликсир бессмертия, 
который искал Цинь Шихуанди...